对我国现行传染病医院和综合医院建筑设计规范进行介绍,并对关键设计要求进行对比.相对于综合医院,传染病医院在选址、医疗流程、给排水及采暖通风等方面有着更为严格的要求.

对比现行国内外架空导线风荷载设计规范,结合具体算例分析了各国规范间的差异.相对于其他国家规范,我国规范风荷载设计值偏小,这主要是风振系数的差异造成的;在部分工况下,我国规范风振系数的计算值小于1,这意味着总的风荷载低于平均风荷载.

At present, the wind-induced response analysis of an overhead conductor is mainly based on the action of horizontal normal wind. However, for crossing hillsides or extremely strong winds, such a conductor will bear the action of updraft wind, which will change the geometry of the conductor and make its structural dynamic characteristics nonlinear to some extent. In this work, the in-plane and out-of-plane two-dimensional nonlinear equations were established under the action of self-weight and updraft wind. Furthermore, the improved equations of conductor tension and sag were obtained, and the wind-induced vibration response was further investigated. The results showed that the updraft wind caused the nonlinearity of the tension and sag of the overhead conductor, and the nonlinear geometric change significantly affected its resonance response, which exceeded 25% if the wind speed was 50 m/s. In addition, because the proportion of the resonance response in the total wind-induced response was different, the influence of the wind attack angle calculated using the gust response factor method on the gust response factor was slightly larger than that calculated using the the American society of civil engineers method.

In the current standards, wind loads on lattice transmission tower (LTT) bodies only account for the action of horizontal winds, which may not be suitable for an LTT under the action of extreme winds. The wind load coefficients of LTT bodies subjected the skewed wind with both horizontal and vertical components were measured via several well-designed wind tunnel tests. The test results and standard calculations of the skewed wind load factors (SWLF) at a wind attack angle of 0° were compared and analyzed. A new parameter—combined wind load factor (CWLF) was introduced, and a suggested formula is proposed for it. The results showed that the standard-recommended formula was unable to accurately reflect the characteristics of SWLF, and its calculated results were significantly smaller than the test results, indicating that the actual wind loads were underestimated. The CWLF could correctly describe how wind load factors changed with the yaw angles or the attack angles. The CWLF effectively improved the calculation accuracy of the SWLF, and the absolute error between the calculations and test results under the critical yaw and attack angles was less than 7%.

Compared with lattice towers with square or rectangle cross sections, triangular lattice towers have the advantage of smaller foundation footprint. Triangular lattice towers have been widely used in transmission towers and communication towers, yet only a few studies have been conducted on their wind loads. Therefore, a series of wind tunnel tests on a triangular lattice tower were conducted using direct force measurements in this study. Effective drag coefficients and effective skewed wind load factors normalized with the “true” windward projected areas were proposed and obtained from the test results. Piecewise functions were suggested to calculate the effective skewed wind load factors and skewed wind load factors. It is found that the skewed wind load factors show an approximate “W” profile which the British standard formula does not fit. The effective skewed wind load factors show a strong regularity and are only related to yaw angles and solidity ratios. The analytical effective skewed wind load factors have a good agreement with fitting results with a maximum error of 3.1%. The recommended formula for skewed wind load factors is concise and can effectively illustrate the changing tendency of drag coefficient curves.