DSDI451仓库备货PLC/DCS模块
4.2.1.1对于结构系统和不可接近部件，除1类建筑外的建筑的设计使用寿命不得少于30年，对于可修复或可更换部件和材料，如包覆层、屋顶材料、外部装饰件和集成部件，如窗户和门，其设计使用寿命应不少于15年。第1类建筑的可修复或可更换部件的设计寿命不少于10年，前提是在设计阶段就进行了升级，且此类升级不需要拆除或拆除现有结构，也不需要应用高度专业化的技能。4.2.1.2施加在结构和结构元件上的代表性永久荷载、外加荷载和地震荷载以及冲击源应符合SANS 10160相关部分的要求。4.2.1.3建筑物上的代表性自由流速度压力应根据SANS 10160相关部分的要求确定并转换为风荷载，前提是a）施加到整个结构系统和住宅结构元件上的自由流速度分别不小于0,37 kPa和0,45 kPa，并且施加到结构元件上的最小风荷载不小于表1中给出的值；和b）施加在独立墙上的最小工作风荷载至少为1）0,58 kPa，距离等于墙的自由端或与墙的开口或不连续处相邻的返回端高度的四倍，以及2）0,41 kPa。4.2.1.4当建筑物受到与25年平均重现期相关的风时，其受损程度不得超过轻微。与50年重现期相关的风损害不应妨碍建筑物实现其预期用途，屋顶覆盖材料和覆层可能损失除外，此类损害也不会对居民构成威胁。在强风或极端风的情况下，建筑物的损坏不得与原因的严重程度不成比例。4.2.1.5应根据SANS 10160相关部分的要求或SANS 10100、SANS 10162、SANS 10263或SANS 10164中规定的要求，根据极限状态标准或许用应力标准评估结构在所有作用作用下的阻力。注：作用包括因材料收缩和蠕变引起的移动，如混凝土、The design working life of a building other than a category 1 building shall be not less than 30 years in respect of the structural system and non-accessible components, and 15 years for repairable or replaceable components and materials, such as claddings, roofing materials, exterior trims, and integrated components, such as windows and doors. Category 1 buildings may have a design life of not less than 10 years in respect of repairable or replaceable components, provided that provision for upgrading is made at the design stage and such upgrading does not require the removal or dismantling of the existing structure and does not require highly specialized skills to be applied. 4.2.1.2 The representative permanent, imposed and seismic loads and impact sources applied to the structure and structural elements shall be in accordance with the requirements of the relevant part of SANS 10160. 4.2.1.3 The representative free stream velocity pressure on buildings shall be determined and converted into a wind load in accordance with the requirements of the relevant part of SANS 10160, provided that a) the free stream velocity pressure applied to the structural system as a whole and to structural elements of dwelling houses is not less than 0,37 kPa and 0,45 kPa, respectively, and the minimum wind load applied to structural elements is not less than that given in table 1; and b) the minimum service wind load applied to free-standing walls is at least 1) 0,58 kPa within a distance equal to four times the height of the wall from a free end or an end with return adjacent to an opening or discontinuity in the wall, and 2) 0,41 kPa elsewhere. 4.2.1.4 Buildings shall suffer no more than minor damage when subjected to winds associated with a 25-year mean recurrence interval. Damage from winds associated with a 50-year recurrence interval shall not prevent the buildings from fulfilling their intended purpose, except for the possible loss of roof covering material and cladding, nor shall such damage pose a threat to the inhabitants. In the case of severe or extreme winds, damage to the building shall not be disproportionate to the severity of the cause. 4.2.1.5 The resistance of the structure under the effects of all actions shall be assessed in terms of limit-state criteria or allowable stress criteria in accordance with the requirements of the relevant part of SANS 10160, or those specified in SANS 10100, SANS 10162, SANS 10163 or SANS 10164. NOTE Actions include movements arising from shrinkage and creep of materials such as concrete, thermal
